Malicious PDF — malware analysis report

Static analysis result for SHA-256 0221d8d498b66e2b…

MALICIOUS

PDF

40.6 KB Created: 2020-08-08 21:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e5efec7a1d343c5bd43673dd2e7c6b0 SHA-1: 202039226b81c0e46019fe7ce5afff3753b49436 SHA-256: 0221d8d498b66e2b0f8e34ea5d7b5f6abd15a38aa28c72742bdc9ab6fe01b096
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at ttraff.com. The document body, though heavily obfuscated, contains the same malicious URL, indicating an attempt to disguise malicious activity as a benign PDF download. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=neck+exercises+for+cervical+spondylosis+pdf
    • http://files.zachroyer.com/uploads/1/3/2/7/132741241/bezetejakevu.pdf
    • http://files.nuvoicesla.org/uploads/1/3/0/8/130813357/kedonisekesuta-zetemulowedarig-tiduzuxupetez.pdf
    • http://files.marinaredlich.com/uploads/1/3/0/9/130969598/fc2135835.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/4079/5806/files/present_perfect_tense_exercises_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/1766/4674/files/boredom_a_lively_history_peter_toohey.pdf
    • https://cdn.shopify.com/s/files/1/0439/4939/2030/files/diwavugizawiluxakepobidet.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/76916894435.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/pobodo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovaratumu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/56841367936.pdf
    • https://cdn.shopify.com/s/files/1/0437/2103/1832/files/56146244107.pdf
    • https://cdn.shopify.com/s/files/1/0448/6466/7810/files/panduan_akreditasi_rumah_sakit_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/0166/5960/files/recumbent_bicycle_design.pdf
    • https://cdn.shopify.com/s/files/1/0430/3824/5017/files/rumuzebemogosunerosap.pdf
    • https://cdn.shopify.com/s/files/1/0436/6467/0873/files/imei_random_number.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006146.bin
b19e897e0a2968ea6050e2bfd1c0ba1c6c6843eb4d76ae56c6b314fcf779a726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6146 5412 bytes
font_01_sfnt_off000073da.bin
c4ab903e4ecf513568ad325eccc86ec2969553e398635be68b45d3def1e5ca37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73DA 9864 bytes

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